(A2A) Donald Michael Kraig’s “Modern Magick” was my first serious book on practical occultism as well. It is an ideal book for beginners because (a) it contains a lot of suitable material to get you started; and more importantly (b) it also has an extensive bibliography which will clue you in as to where to go and what to read to pursue your studies further.
Other books I generally recommend:
(For beginners):
- “The Art & Practice of Astral Projection” – Ophiel;
- “The Mystical Qabalah” and “Sane Occultism” – both by Dion Fortune;
- “The Middle Pillar” – Israel Regardie.
- “Hermetica” – Freke & Gould
(More advanced):
- “The Golden Dawn” – Israel Regardie;
- “Magick In Theory & Practice” – Aleister Crowley;
- “The Alchemist’s Handbook” – Frater Albertus;
- “Initiation Into Hermetics” – Franz Bardon;
(Even more advanced):
“The Greek Magical Papyri In Translation” (H D Betz), “Transcendental Magic – its Dogma and Ritual” (Eliphas Levi), “Light on Yoga” (BKS Iyengar), other books by Dion Fortune, Israel Regardie, Crowley, S L MacGregor Mathers, primary texts on Adam McLean’s Alchemy website / Joseph H Peterson’s website, etc, etc, etc.
Source: Alex Sumner’s answer to What is your source of occult information? – Quora